We used to have a roadie called Paul who had a hand-painted black transit van that had a top speed of about 50mph...
We were playing in Exeter, iirc, and drove back to London slowly. All of us were a bit knacked (and possibly lubricated - there'd been a couple of cases of beer for us!) so the band all fell asleep on top of the amps'n'cabs in the back.
I woke up quite a while later to discover we were in the middle of nowhere, no motorway anywhere in site, just very dark countryside.
Turns out that Paul, who looked a bit like Camberwell Carrot man in Withnail and I (and usually had something similar in his mouth) had this thing where he'd follow the line on the left of the road. With us all asleep he'd done that and now we were on a single track lane somewhere in Oxfordshire.
From then on we made sure someone was always awake to keep him on the correct road!